testad03 Chlorine (Cl) is one of the basic elements and its natural state is a that of a deadly gas. Chlorine dissolves in water to form equal parts of hypochlorous acid (HOCl) and hydrochloric acid (HCl). Hypochlorous acid is also known as free chlorine, which is the most common type of water sanitizer. In the proper concentrations, it helps to ensure that water is safe to drink and prevents the spread of waterborne disease.

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